Abstract
The nitrile hydratase (NHase) of Rhodococcus rhodochrous PA-34 catalyzed the conversion of acrylonitrile to acrylamide. The resting cells (having NHase activity) (8 %; 1 mL corresponds to 22 mg dry cell mass, DCM) were immobilized in polyacrylamide gel containing 12.5 % acrylamide, 0.6 % bisacrylamide, 0.2 % diammonium persulfate and 0.4 % TEMED. The polyacrylamide entrapped cells (1.12 mg DCM/mL) completely converted acrylonitrile in 3 h at 10 °C, using 0.1 mol/L potassium phosphate buffer. In a partitioned fed batch reactor, 432 g/L acrylamide was accumulated after 1 d. The polyacrylamide discs were recycled up to 3×; 405, 210 and 170 g/L acrylamide was produced in 1st, 2nd and 3rd recycling reactions. In four cycles, a total of 1217 g acrylamide was produced by recycling the same mass of entrapped cells.
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Abbreviations
- DCM:
-
dry cell mass
- NHase(s):
-
nitrile hydratase(s)
- PAA:
-
polyacrylamide
- PPB:
-
potassium phosphate buffer
- PVA:
-
polyvinyl alcohol
- TEMED:
-
N,N,N′,N′-tetramethylethylenediamine
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Raj, J., Prasad, S., Sharma, N.N. et al. Bioconversion of acrylonitrile to acrylamide using polyacrylamide entrapped cells of Rhodococcus rhodochrous PA-34. Folia Microbiol 55, 442–446 (2010). https://doi.org/10.1007/s12223-010-0074-x
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DOI: https://doi.org/10.1007/s12223-010-0074-x